alexa Thin porous alumina sheets as supports for stabilizing gold nanoparticles.
Chemical Engineering

Chemical Engineering

Journal of Advanced Chemical Engineering

Author(s): Wang J, Lu AH, Li M, Zhang W, Chen YS,

Abstract Share this page

Abstract Thin porous alumina sheets have been synthesized using a lysine-assisted hydrothermal approach resulting in an extraordinary catalyst support that can stabilize Au nanoparticles at annealing temperatures up to 900 °C. Remarkably, the unique architecture of such an alumina with thin sheets (average thickness ~15 nm and length 680 nm) and rough surface is beneficial to prevent gold nanoparticles from sintering. HRTEM observations clearly showed that the epitaxial growth between Au nanoparticles and alumina support was due to strong interfacial interactions, further explaining the high sinter-stability of the obtained Au/Al2O3 catalyst. Consequently, despite calcination at 700 °C, the catalyst maintains its gold nanoparticles of size predominantly 2 ± 0.8 nm. Surprisingly, catalyst annealed at 900 °C retained the highly dispersed small gold nanoparticles. It was also observed that a few gold particles (6-25 nm) were encapsulated by an alumina layer (thickness less than 1 nm) to minimize the surface energy, revealing a surface restructuring of the gold/support interface. As a typical and size-dependent reaction, CO oxidation is used to evaluate the performance of Au/Al2O3 catalysts. The results obtained demonstrated Au/Al2O3 catalyst calcined at 700 °C exhibited excellent activity with a complete CO conversion at ∼30 °C (T100\% = 30 °C), and even after calcination at 900 °C, the catalyst still achieved its T50\% at 158 °C. In sharp contrast, Au catalyst prepared using conventional alumina support shows almost no activity under the same preparation and catalytic test conditions. This article was published in ACS Nano and referenced in Journal of Advanced Chemical Engineering

Relevant Expert PPTs

Recommended Conferences

  • 6th World Congress on Biopolymers
    September 7-9, 2017 Paris, France
  • 2nd Euro Global Summit and Expo on Biomass
    September 21-22, 2017 Madrid, Spain
  • 7th International Congress on Biofuels and Bioenergy
    October 2-4, 2017 Toronto, Canada
  • 3rd International Conference on Chemical Engineering
    October 2-4, 2017 Chicago, USA
  • 7th International Conference and Exhibition on Biopolymers and Bioplastics
    October 19-21, 2017 San Francisco, USA
  • 6th International Congress on Biofuels, Bioenergy and Bioeconomy
    December 04-06, 2017 Sao Paulo, Brazil
Peer Reviewed Journals
 
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
 
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

 
© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version
adwords